GESTRA LRGT 16-3 Installation & Operating Manual
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GESTRA LRGT 16-3 Installation & Operating Manual

Conductivity transmitter
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E N
E n g l i s h
Conductivity Transmitter
LRGT 16-3
LRGT 16-4
LRGT 17-3
Original Installation &
Operating Manual
819877-00

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Summary of Contents for GESTRA LRGT 16-3

  • Page 1 Conductivity Transmitter LRGT 16-3 LRGT 16-4 LRGT 17-3 Original Installation & Operating Manual 819877-00 E n g l i s h...

  • Page 2: Table Of Contents

    LRGT 16-3 ............................... 22 LRGT 16-4 ............................... 22 LRGT 17-3 ............................... 22 Overall view ..............................23 Dimensions of the LRGT 16-3........................24 Dimensions of the LRGT 16-4........................25 Dimensions of the LRGT 17-3........................26 Installation ..............................27 Additional notes for installation ........................ 28 Example, LRGT 16-3 ..........................
  • Page 3 Contents Aligning the terminal box ..........................34 Functional elements ............................. 35 Electrical connection ............................ 36 Notes on electrical connection ......................... 36 Connecting the 24V DC power supply ...................... 36 Connecting the actual value output (4-20 mA)..................36 Pin assignment of the M12 connector for non pre-wired control cables ........... 36 Bringing into service ............................

  • Page 4: Content Of This Manual

    ■ ■ 1 x Installation & Operating Manual ■ ■ Required accessories for LRGT 16-3, LRGT 17-3 and LRGT 16-4 when installing for the first time 1 x cable jack, Hirschmann ELWIKA 5012 ■ ■ LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 5: How To Use This Manual

    How to use this Manual This Installation & Operating Manual describes how to correctly use LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters. It applies to persons who integrate this equipment in control systems, install, bring into service, operate, maintain and dispose of this equipment. Anyone carrying out the above-mentioned activities must have read this Installation &...

  • Page 6: Types Of Warning

    Types of warning DANGER Warning of a dangerous situation that results in death or serious injury. WARNING Warning of a dangerous situation that may possibly result in death or serious injury. CAUTION Warning of a situation that may result in minor or moderate injury. ATTENTION Warning of a situation that results in damage to property or the environment.

  • Page 7: Specialist Terms/Abbreviations

    International standard IEC 61508 forms the basis for establishing, testing and operating technical safety systems. LRGT .. / LRR .. / URS .. / URB .. / SRL .. / etc. Equipment and type designations of GESTRA AG. SELV Safety Extra Low Voltage...

  • Page 8: Usage For The Intended Purpose

    “Technical data” on page 16 and “Name plate/Identification” on page 19. Applicable directives and standards LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters have been tested and approved for use in the scope governed by the following directives and standards:...

  • Page 9: Admissible System Components, Dependent On The Required Safety Level

    You can find the latest Installation & Operating Manuals for other system components on our ■ ■ website: http://www.gestra.com/documents/brochures.html Improper use There is a danger of death due to explosion if the equipment is used in potentially explo- sive atmospheres.

  • Page 10: Basic Safety Information

    ■ ■ Attempts to repair the equipment will cause the plant to become unsafe. The LRGT 1x-x conductivity electrode may only be repaired by the manufacturer, GESTRA AG. ■ ■ Only replace faulty equipment with identical equipment from GESTRA AG.

  • Page 11: Required Personnel Qualifications

    Basic safety information A lack of proper maintenance and cleaning can result in damage to the conductivity electrode and/or false measurement results and warning messages. Once a year, check the conductivity electrode by performing reference measurements. ■ ■ If the “CF” (cell constant) value of 003.0 is exceeded after recalibration, the warning message “CF.Hi”...

  • Page 12: Functional Safety, Safety Integrity Level (Sil)

    When combined with the accessories, you will have a type B subsystem. The technical and safety characteristics in Fig. 2 below are based solely on LRGT 16-3, LRGT 16-4 and LRGT 17-3 conductivity transmitters.

  • Page 13: Reliability Data To En 61508

    Reliability data to EN 61508 Description Characteristic values Type of electrode LRGT 1x-3 LRGT 16-4 Safety integrity level SIL 2 SIL 2 Architecture 1oo1 1oo1 Type of equipment Type B Type B Hardware error tolerance HFT = 0 HFT = 0 Overall failure rate for dangerous undetected λ...

  • Page 14: Function

    4-20 mA current signal. Measuring process of the LRGT 16-3 and LRGT 17-3 LRGT 16-3 and LRGT 17-3 conductivity transmitters use the conductometric two-electrode measuring process. A measuring current with a suitable frequency for the measuring range is introduced into the fluid.
  • Page 15 Electrode faults cannot be acknowledged. When the fault is corrected, the message also disappears from the display of the conductivity transmitter, and the LRGT 16-3, LRGT 17-3 or LRGT 16-4 returns to normal operation. Behaviour when performing the test function * Initiating the test function by pressing the rotary knob on the LRGT 1x-x causes the maximum output current of 20 mA to be output.

  • Page 16: Technical Data

    Technical data Model and mechanical connection LRGT 16-3, LRGT 16-4, LRGT 17-3 Thread G1 A, EN ISO 228-1, see Fig. 7, 8 and 9 ■ ■ Nominal pressure rating, admissible service pressure and temperature LRGT 16-3 PN 40 32 bar (g) at 238 °C ■...
  • Page 17 * Resolution for internal processing based on 15 bits with plus or minus sign (16 bits). The above figures refer to the uncompensated conductivity. Time constant “T” (measured using the two-bath process) Temperature Conductivity LRGT 16-3, LRGT 17-3 9 seconds 14 seconds ■ ■ LRGT 16-4...
  • Page 18 Transport temperature: - 40 °C – 80 °C ■ ■ Air humidity: 10 % – 95 %, non-condensing ■ ■ Weight LRGT 16-3, LRGT 16-4, LRGT 17-3 approx. 2.1 kg ■ ■ LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 19: Name Plate/Identification

    Data interface IEC 61508 SIL 2 Safety integrity level CE marking Current TÜV. XXX . XX-XXX approval Appointed authority 0525 GESTRA AG Protection class Manufacturer Münchener Str. 77 28215 Bremen Disposal information GERMANY Serial number Fig. 3 The date of production (quarter and year) is stamped on the screw-in body of each conductivity transmitter.
  • Page 20 OUT: 4-20 mA / 500 W IEC 61508 SIL 2 IEC 61508 SIL 2 TÜV. XXX . XX-XXX TÜV. XXX . XX-XXX 0525 0525 GESTRA AG GESTRA AG Münchener Str. 77 Münchener Str. 77 28215 Bremen 28215 Bremen GERMANY GERMANY Fig.

  • Page 21: Factory Settings

    Factory settings LRGT 1x-x conductivity electrodes are delivered ex works with the following settings: Parameter values Parameter Display in menu Unit LRGT 16-3 LRGT 16-4 LRGT 17-3 Cell constant 0.210 Temperature coefficient % / °C 002.1 Filter constant (damping) FiLt...

  • Page 22: Overall View

    Overall view LRGT 16-3 LRGT 16-4 LRGT 17-3 Fig. 6 LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 23: Overall View

    Sealing ring D 33 x 39, form D, DIN 7603-2.4068, bright annealed Electrode thread Threaded pin M2.5 mm (LRGT 16-3, LRGT 17-3) Measuring tube with measuring electrode (LRGT 16-3, LRGT 17-3), measuring electrodes (LRGT 16-4) Spacer disc LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 24: Dimensions Of The Lrgt 16-3

    Dimensions of the LRGT 16-3 b = 70 Size 41 Thermal insulation provided at the site x = available electrode lengths: 200 mm ■ ■ 300 mm ■ ■ 400 mm ■ ■ 500 mm ■ ■ 600 mm ■ ■...

  • Page 25: Dimensions Of The Lrgt 16-4

    Dimensions of the LRGT 16-4 b = 70 Size 41 Thermal insulation provided at the site x = available electrode lengths: 180 mm ■ ■ 300 mm ■ ■ 380 mm ■ ■ 500 mm ■ ■ 600 mm ■ ■ 800 mm ■...

  • Page 26: Dimensions Of The Lrgt 17-3

    Dimensions of the LRGT 17-3 b = 70 Size 41 Thermal insulation provided at the site x = available electrode lengths: 200 mm ■ ■ 300 mm ■ ■ 400 mm ■ ■ 500 mm ■ ■ 600 mm ■ ■ 800 mm ■...

  • Page 27: Installation

    Installation If the equipment is to be installed outdoors without the protection of a building, environ- mental influences may adversely affect function. Pay attention to the admissible ambient conditions in the technical data, ■ ■ see page 18. Do not operate the equipment if the temperature is below freezing. ■...

  • Page 28: Additional Notes For Installation

    False measurement results are a risk to plant safety. Therefore, always adhere to the distances stated below. LRGT 16-3, LRGT 17-3 Provide spacing of approx. 30 mm between the lower end of the measuring tube and the ■...

  • Page 29: Example, Lrgt 16-3

    Installation Sealing surface dimensions for Inspect the sealing surfaces of the threaded LRGT 16-3, LRGT 16-4, LRGT 17-3 standpipe of the tank or the flange cover. Sealing surfaces must be perfectly machined, Ø 40 mm as shown in Fig. 10.
  • Page 30 (with size 41 open-ended spanner attachment). Tightening torque when cold: LRGT 16-3, LRGT 16-4, LRGT 17-3 = 250 Nm ■ ■ Installation examples with dimensions, see Fig. 12, Fig. 13, Fig. 14, page 31 ff. 31...

  • Page 31: Installation Examples With Dimensions

    ~ 250 Sealing ring D 33 x e.g. LRGT 16-3 39 DIN 7603-2.4068, bright annealed * Minimum distances (R) LRGT 16-3 / LRGT 17-3 R = 30 mm ■ ■ LRGT 16-4 R = 60 mm ■ ■ Fig. 12 All lengths and diameters in mm LRGT 1x-x - Installation &...

  • Page 32: Conductivity Monitoring And Continuous Blowdown Control

    Sealing ring D 33 x 39 DIN 7603-2.4068, bright annealed * Minimum distances (R): Distance (A), depending on connection flange: LRGT 16-3 / LRGT 17-3 R = 30 mm DN 15 mm A = 182 mm ■ ■ ■ ■...

  • Page 33: Conductivity Monitoring And Continuous Blowdown Control Via A Separate Level Pot

    Outlet DN 15 - 40 Inlet DN 15 - 40 Sealing ring D 33 x 39 e.g. LRGT 16-3 DIN 7603-2.4068, bright annealed Fig. 14 All lengths and diameters in mm LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 34: Key For Fig. 12 To Fig. 14

    Installation examples with dimensions Key for Fig. 12 to Fig. 14 Boiler drum Shut-off valve GAV Continuous blowdown valve BAE T-type connector Level pot Aligning the terminal box If necessary, you can orientate the display in the desired direction by rotating the terminal box. ATTENTION Rotating the terminal box ≥...

  • Page 35: Functional Elements

    Functional elements Fig. 15 Terminal box Cover screws M4 x 16 mm Operating panel with 4-digit LCD display/malfunction and status LEDs and rotary knob, see page 45 M12 connector, 5-pole, A-coded LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 36: Electrical Connection

    Connecting the 24V DC power supply LRGT 16-3, LRGT 17-3 and LRGT 16-4 conductivity transmitters are supplied with 24 V DC. ■ ■ A safety power supply unit that delivers a Safety Extra Low Voltage (SELV) and is isolated from ■...

  • Page 37: Bringing Into Service

    Bringing into service Before bringing into service, check that the conductivity transmitter is correctly connected. ■ ■ Next, switch on the supply voltage. ■ ■ Changing the factory settings if necessary You will need the following tools Slotted screwdriver, size 2.5 ■...
  • Page 38 Bringing into service Selecting and setting a parameter: Using the screwdriver, turn the rotary knob clockwise or anti-clockwise until the desired parameter appears on the display. The set value is displayed after approx. 3 seconds. The display alternates between the set parameter and its actual value, e.g.
  • Page 39 If numbers or decimal points are displayed incorrectly or not at all, you must replace the ■ ■ conductivity transmitter with an identical one from GESTRA AG. Manually initiate a display test. Alternatively, initiate the display test by pressing “diSP”, see page 43.

  • Page 40: Changing The Cell Constant

    Bringing into service Changing the cell constant Notes on calibrating the cell constant The cell constant of the LRGT 1x-x conductivity transmitter is precisely set at the factory. If recalibration is necessary at the installation site due to the conditions there, (see page 44, comparing the reading with a reference reading), you may change the cell constant on site.

  • Page 41: Changing The Temperature Coefficient

    Bringing into service Changing the temperature coefficient You can adjust the temperature coefficient manually, as long as an appropriate value has been established. The factory setting of “2.1” is normally used for steam generating units with a constant pressure. For newly installed electrodes, this figure may need to be adapted in line with the temperature coefficient of the boiler water.

  • Page 42: Using The "Filt" Feature

    Bringing into service Using the “FiLt” feature The aim of this feature is to “smooth” the 4-20 mA actual value output of the conductivity transmitter for use on the controller. The adjustable time constant (1 - 30 seconds) influences both the current output and the ■...

  • Page 43: Changing The Display Unit (Μs/Cm Or Ppm)

    Faulty equipment jeopardises system safety. If numbers or decimal points are displayed incorrectly or not at all, you must replace the ■ ■ conductivity transmitter with an identical one from GESTRA AG. LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 44: Comparing The Reading With The Reference Reading From A Reliable Sample

    “tC” until the indicated reading matches the reference reading. Also see the description of parameter “tC” on page 41. The LRGT 1x-x conductivity transmitter may only be repaired by the manufacturer, GESTRA AG. ■ ■ Only replace faulty equipment with identical equipment from GESTRA AG.

  • Page 45: Starting, Operation And Testing

    Starting, operation and testing Fig. 17 The operating panel: Actual value display/fault code/limit value, green, 4 digits LED 1, fault, red LED 3, unit µS/cm, green LED 4, unit ppm, green LED 2, function OK, green Rotary knob/push-button for operation and settings Notes on the priority of the various indications Fault indications are displayed based on their priority.
  • Page 46 Starting, operation and testing Cross-reference of displays and LEDs and the operating state of the conductivity transmitter: Start All LEDs light up - Test The system is started and tested. The LEDs and display are tested. Display: S-xx = software version Switch on t-09 = equipment type supply voltage...
  • Page 47 ■ ■ faulty. Perform failure analysis. ■ ■ The LRGT 1x-x conductivity transmitter may only be repaired by the manufacturer, GESTRA AG. ■ ■ Only replace faulty equipment with identical equipment from GESTRA AG. ■ ■ LRGT 1x-x - Installation & Operating Manual - 819877-00...

  • Page 48: System Malfunctions

    System malfunctions Causes System malfunctions occur as the result of incorrect installation, overheating of equipment, radiated interference to the supply network, or faulty electronic components. Check the installation and configuration before systematic troubleshooting Installation: Check that the installation location complies with the admissible ambient conditions in terms of ■...

  • Page 49: Indication Of System Malfunctions Using Fault Codes

    System malfunctions Indication of system malfunctions using fault codes Fig. 18 Actual value display/fault code/limit value, green, 4 digits Fault code table Internal Fault code Possible faults Remedy designation LFKurzschlussErr Short circuit in conductivity measure- E.001 Replace conductivity transmitter (CondShortCircuitErr) ment (electrode wires) Check installation location LFKabelbruchErr (Con-...
  • Page 50 System malfunctions Fault code table Internal Fault code Possible faults Remedy designation 16-bit AD converter E.014 ADSReadErr Replace conductivity transmitter does not respond E.015 UnCalibErr Calibration invalid Replace conductivity transmitter Second shutdown path of E.017 ENDRVErr Replace conductivity transmitter 4-20 mA analogue output faulty E.018 V12NegErr System voltage -12 V outside tolerance...

  • Page 51: Faults That Do Not Provoke A Shutdown

    Has the electrode been correctly insulated to prevent ■ ■ leakage? Replace the conductivity transmitter with an identical ■ ■ unit from GESTRA AG. The inner seals of the electrode rods Replace the conductivity transmitter with an identical ■ ■ are damaged.

  • Page 52: Checking Installation And Function

    System malfunctions Checking installation and function When you have remedied system malfunctions, perform a function test as follows. Check installation and function. ■ ■ Check the indicated reading and perform an equipment test, see page 47, when bringing into ■ ■ service and whenever the LRGT 1x-x conductivity transmitter has been replaced.

  • Page 53: Taking Out Of Service/Disassembly

    Taking out of service/Disassembly DANGER Danger to life from scalding caused by the sudden escape of hot steam. Hot steam or hot water can escape suddenly if the conductivity electrode is unscrewed while under pressure. Reduce the boiler pressure to 0 bar and check the pressure before you unscrew the ■...

  • Page 54: Cleaning The Measuring Electrodes Of The Conductivity Transmitter

    Scrub off stubborn deposits using sandpaper (medium grain). Continue as described below: = key to overall view, see page 23 LRGT 16-3, LRGT 17-3, LRGT 16-4 Install the clean conductivity transmitter as described on page 27. Switch on the supply voltage.

  • Page 55: Disposal

    Please see our Declaration of Conformity for details on the conformity of our equipment with European Directives. The current Declaration of Conformity can be found on the internet at www.gestra.com or requested from LRGT 1x-x - Installation & Operating Manual - 819877-00...
  • Page 56 You can find our authorised agents around the world at: www.gestra.com GESTRA AG Münchener Strasse 77 28215 Bremen Germany Phone +49 421 3503-0 +49 421 3503-393 e-mail info@de.gestra.com www.gestra.com 819877-00/09-2019cm (808953-00) · GESTRA AG · Bremen · Printed in Germany...

This manual is also suitable for:

Lrgt 16-4Lrgt 17-3

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